High in nutritional value they are rich in minerals such as zinc and iron as well as vitamins A, B1, B2 and C Oyster shell is used in traditional Chinese medicine to help with hypertension, heart palpitations, insomnia, dizziness, blurry vision, cold sweats and swollen lymph glands An oyster's blood is colourless There is no way of telling male oysters from females by examining their shells While oysters have separate sexes, they may change sex one or more times during their lives

Christopher, who is probably best known to TV viewers as Dr Simon Kaminsky in Casualty, said: "Comic Relief is a fantastically important, successful and creative charity event and I am really proud to be able to contribute - except that right now I'm so scared about performing live in front of the nation that I keep waking up in cold sweats thinking 'why oh why oh why?

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